/*
 * Copyright (C) 2008 ZXing authors
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.hethongviet.vending.qrcode;

import com.hethongviet.vending.R;

import android.annotation.SuppressLint;
import android.app.Activity;
import android.app.AlertDialog;
import android.content.Intent;
import android.graphics.Bitmap;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.view.View;
import android.view.ViewTreeObserver.OnGlobalLayoutListener;
import android.widget.ImageView;
import android.widget.TextView;

/**
 * This class encodes data from an Intent into a QR code, and then displays it
 * full screen so that another person can scan it with their device.
 * 
 * @author dswitkin@google.com (Daniel Switkin)
 */
@SuppressLint("HandlerLeak")
public final class EncodeActivity extends Activity
{

	private QRCodeEncoder qrCodeEncoder;
	private boolean firstLayout;

	/**
	 * This needs to be delayed until after the first layout so that the view
	 * dimensions will be available.
	 */
	private final OnGlobalLayoutListener layoutListener = new OnGlobalLayoutListener()
	{
		public void onGlobalLayout()
		{
			if (firstLayout)
			{
				View layout = findViewById(R.id.encode_view);
				int width = layout.getWidth();
				int height = layout.getHeight();
				int smallerDimension = width < height ? width : height;
				smallerDimension = smallerDimension * 7 / 8;

				Intent intent = getIntent();
				try
				{
					qrCodeEncoder = new QRCodeEncoder(EncodeActivity.this,
							intent);
					setTitle(getString(R.string.app_name) + " - "
							+ qrCodeEncoder.getTitle());
					qrCodeEncoder.requestBarcode(handler, smallerDimension);
				} catch (IllegalArgumentException e)
				{
					showErrorMessage("Couldn't encode this");
				}
				firstLayout = false;
			}
		}
	};

	private final Handler handler = new Handler()
	{
		@Override
		public void handleMessage(Message message)
		{
			switch (message.what)
			{
				case R.id.encode_succeeded:
					Bitmap image = (Bitmap) message.obj;
					ImageView view = (ImageView) findViewById(R.id.image_view);
					view.setImageBitmap(image);
					TextView contents = (TextView) findViewById(R.id.contents_text_view);
					contents.setText(qrCodeEncoder.getDisplayContents());
					// qrCodeEncoder = null;
					break;
				case R.id.encode_failed:
					showErrorMessage("Barcode encoding failed.");
					qrCodeEncoder = null;
					break;
			}
		}
	};

	@Override
	public void onCreate(Bundle icicle)
	{
		super.onCreate(icicle);

		Intent intent = getIntent();
		if (intent != null)
		{
			String action = intent.getAction();
			if (action.equals(ConstantEncode.ACTION)
					|| action.equals(Intent.ACTION_SEND))
			{
				setContentView(R.layout.page_encode);
				return;
			}
		}
		finish();
	}

	@Override
	protected void onResume()
	{
		super.onResume();
		View layout = findViewById(R.id.encode_view);
		layout.getViewTreeObserver().addOnGlobalLayoutListener(layoutListener);
		firstLayout = true;
	}

	private void showErrorMessage(String message)
	{
		AlertDialog.Builder builder = new AlertDialog.Builder(this);
		builder.setMessage(message);
		builder.setPositiveButton("Ok", new FinishListener(this));
		builder.setOnCancelListener(new FinishListener(this));
		builder.show();
	}
}
